PDF malware analysis — malicious · 921751ebea04abb9

MALICIOUS

PDF

36.7 KB Created: 2021-07-03 14:24:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 9bcb4fbdd2d1c199c115783854d4d063 SHA-1: d1bdc85c95a0e85c7602191baf1695becb1a399d SHA-256: 921751ebea04abb98a90cce12d8a91bc88a8632f6d792292b285cbf2d8691914

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, indicating a phishing or scam attempt. The presence of a malicious redirector link suggests the primary purpose is to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a lure for initial access, likely via social engineering.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE

PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://netcdn.tw/app/406889139/coin-master-hack-uk-game-hack In PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-coin-master-links_GM406889139.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/roblox-natural-disaster-survival-hack_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/i-just-got-free-robux_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/roblox-mobile-app-free-download_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-hack-pro_GM406889139.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-robux-no-password_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/minecraft-pe_GM479516143.pdfIn PDF document text
- http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00003898.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3898	23288 bytes
SHA-256: `3002e6af90ba7594b8484b7b56306b83d2eeb6cbde737624989570d2989b619d`
`font_01_sfnt_off00006d04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D04	18192 bytes
SHA-256: `5a1314554b862e463104f1d7a36b57872b05aaf837fd88a512663257e0a14472`

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